From: Jonathan Spencer, [EMAIL PROTECTED]
>Temperature is irrelevant, it is thermal capacity that
>matters. Thermal capacity is the quantity of heat energy
>required to affect a temperature change.
And heat exchange in proportional to temperature difference.
>Look at it this
>way; the heat from a candle flame is around 1000 degrees
>Centigrade, more than enough to give severe burns and yet
>you can pass your hand through the flame and not feel a
>thing.
Yup, and an atomic explosion last only a tiny fraction
of a second and yet the flash from it will melt all kinds
of things including stone. It just isn't as simple as
you paint it.
>What has pressure got to do with anything?
Everything! :-) Nitro propellant only works when it is
constrained, and it burns at a much higher pressure and
temperature than when outside a gun.
>Fire a round of 7.62 and see how much lead is in the
>barrel, you wont see any.
You may not *see* it, but try executing a chemical test
(e.g. sodium rhodizonate) for lead and you will find it
in abundance.
Take a look at http://wwww.firearmsID.com and look at
the gunshot residues pages. Then explain to us once
again that no lead is liberated, and if that is true,
why the chemical tests respond the way they do. It is
because lead is *vaporised* by the high temperature
gases inside the barrel. This is then deposited on the
clothing as shown on those pages and indicated by the
violet response.
It is for this reason - lead poisoning - that total
metal jackets were developed. Airborne vaporised lead
levels were far too high on indoor ranges, and so the
total metal jacket bullet was developed as a way of
minimising airborne lead levels.
>--
>Perhaps it has to do more with
>that you can get a more consistent base with
>HPBT than FMJ.
That's what the Sierra reloading manual says.
--Jonathan Spencer, firearms examiner
"Justice is open to everybody in the same way as the Ritz Hotel."
Judge Sturgess, 22 July 1928
Cybershooters website: http://www.cybershooters.org
List admin: [EMAIL PROTECTED]
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